CN217150155U - Super thick silt foundation structure - Google Patents

Abstract

The utility model discloses an ultra-thick silt foundation structure, in the structure, the original earthwork layer is positioned at the ultra-thick silt foundation position for removing a silt layer, a first layer of manually improved lime-soil is stacked on the original earthwork layer, the first layer of manually improved lime-soil has a first thickness, and the first layer of manually improved lime-soil comprises silt removed from the silt layer; the middle graded broken stone layer is laminated on the first layer of artificially improved lime-soil, the middle graded broken stone layer has a second thickness, the third layer of artificially improved lime-soil is laminated on the middle graded broken stone layer, and the third layer of artificially improved lime-soil has a third thickness and comprises the removed sludge in the sludge layer; a plurality of filling piles are vertically arrayed and distributed at the position of the super-thick sludge foundation, the filling piles are supported on the original earthwork layer and sequentially penetrate through the third layer of manually improved lime soil, the middle graded broken stone layer and the first layer of manually improved lime soil; the sand-stone layer is laid on the third layer of artificially improved lime soil; the concrete cushion layer is laid on the sand stone layer. This structure has guaranteed that the foundation bearing capacity has reduced the engineering volume of piling when satisfying the design requirement.

Description

Super thick silt foundation structure

Technical Field

The utility model relates to a foundation construction technical field especially relates to a super thick silt foundation structure of superelevation layer.

Background

With the rapid development of economy and the advance of urbanization, construction projects expand to villages and towns, and construction land may involve original farming land ploughing and planting soil and original fish pond mucky soil. In the construction of buildings, the foundation structure is usually excavated and constructed first and foremost. At present, after foundation excavation to a design elevation exists in an original plowed and planted soil or an original fish pond position or an area component foundation with relatively complex hydrological conditions, the foundation has poor soil such as silt, and the bearing capacity of the foundation cannot meet design requirements. In order to make the foundation bearing capacity meet the design requirements, effective foundation treatment measures must be taken. Therefore, the super-thick silt foundation structure which is more effective, economical, green and environment-friendly is provided.

The above information disclosed in the background section is only for enhancement of understanding of the background of the invention and therefore it may contain information that does not form the prior art that is well known to those of ordinary skill in the art.

SUMMERY OF THE UTILITY MODEL

The utility model provides a super thick silt foundation structure, it adopts artifical improvement lime-soil, gradation rubble, artifical improvement lime-soil combination to trade and fills the material and carry out the silt and trade and fill, supplements each other, improves construction quality, reduces the engineering volume of piling for the construction progress has reduced engineering cost.

In order to achieve the above object, the present invention provides the following technical solutions:

the utility model discloses a super thick silt foundation structure includes:

the original earthwork layer is positioned at the position of the ultra-thick silt foundation for removing the silt layer,

a first layer of artificially modified lime soil layered on the existing earthwork layer, the first layer of artificially modified lime soil having a first thickness, the first layer of artificially modified lime soil including sludge in the removed sludge layer;

an intermediate graded crushed stone layer laminated on the first layer of artificially improved lime soil, the intermediate graded crushed stone layer having a second thickness,

a third layer of artificially modified lime-soil laminated on the middle graded crushed stone layer, the third layer of artificially modified lime-soil having a third thickness, the third layer of artificially modified lime-soil including sludge in the removed sludge layer;

the filling piles are vertically distributed at the position of the super-thick sludge foundation in an array mode, are supported on the original earthwork layer and sequentially penetrate through the third layer of manually improved lime soil, the middle grading gravel layer and the first layer of manually improved lime soil;

the sandstone layer is laid on the third layer of artificially improved lime soil and has a fourth thickness;

and the concrete cushion layer is laid on the gravel layer and has a fifth thickness.

In an ultra-thick sludge foundation structure, the second thickness is at least 300 mm.

In an ultra-thick sludge foundation structure, the first thickness is one third of the thickness of the sludge layer.

In the super-thick sludge foundation structure, the top of the cast-in-place pile is flush with the top of the third layer, and the top of the third layer is manually improved to a preset height.

In an ultra-thick sludge foundation structure, the predetermined height is 500 mm.

In an ultra-thick sludge foundation structure, the third thickness is greater than the first thickness.

In an ultra-thick sludge foundation structure, the fourth thickness is at least 300mm and the fifth thickness is at least 100 mm.

The utility model discloses a super thick silt indicates silt layer thickness more than or equal to 3 meters.

In the technical scheme, the utility model provides a pair of super thick silt foundation structure has following beneficial effect: the ultra-thick silt foundation structure adopts three layers of combined filling materials of artificially improved lime soil, graded broken stone and artificially improved lime soil to fill, adopts a long screw rod drilling machine to form holes, pours concrete to form piles, and finally lays a 300mm thick graded broken stone mattress cushion layer to form a composite foundation so as to ensure the composite design requirement of the bearing capacity of the foundation. The artificially improved lime soil has similar characteristics with the subsoil, good stability and larger graded broken stone bearing capacity, the bearing capacity of the filling and replacement foundation formed by combining the lime soil and the subsoil is larger, the influence of underground water on the foundation is effectively reduced, the area replacement rate is smaller, the engineering quantity of piling can be obviously reduced, the influence on the subsequent long spiral cast-in-place pile and foundation excavation construction after filling and replacement is smaller, and the original earthwork in the site, such as plain soil, expansive soil and rock soil, is utilized for artificial improvement. The long spiral cast-in-place pile is not provided with ribs, the pile body is cast by adopting commercial concrete, the mix proportion of the commercial concrete is configured according to the actual geological conditions and environment on site, the quality of the concrete is guaranteed, and the casting efficiency is high. The utility model discloses from quality, economic nature, maneuverability all satisfy the requirement, when having ensured that the ground bearing capacity satisfies the designing requirement, reduced the engineering volume of pile, effectively improved the speed of construction, saved engineering cost greatly.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present invention, and other drawings can be obtained by those skilled in the art according to these drawings.

Fig. 1 is a schematic structural view of an ultra-thick sludge foundation structure.

Fig. 2 is a schematic structural view of an embodiment of an ultra-thick sludge foundation structure.

Detailed Description

To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the drawings of the embodiments of the present invention are combined to clearly and completely describe the technical solutions of the embodiments of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In order to make those skilled in the art better understand the technical solution of the present invention, the present invention will be further described in detail with reference to the attached drawings.

As shown in fig. 1-2, in one embodiment, in an ultra-thick silt foundation structure of the present invention,

an original earthwork layer 7 located at a location of an ultra-thick silt foundation from which the silt layer is removed,

a first layer of artificially modified soil 1 stacked on the existing earthwork layer 7, the first layer of artificially modified soil 1 having a first thickness, the first layer of artificially modified soil 1 including sludge in the removed sludge layer;

an intermediate graded crushed stone layer 2 laminated on the first layer of artificially improved soil 1, the intermediate graded crushed stone layer 2 having a second thickness,

a third layer of artificially modified soil 3 laminated on the middle graded crushed stone layer 2, the third layer of artificially modified soil 3 having a third thickness, the third layer of artificially modified soil 3 including sludge in the removed sludge layer;

the cast-in-place piles 4 are vertically distributed at the position of the ultra-thick sludge foundation in an array mode, the cast-in-place piles 4 are supported on the original earthwork layer 7 and sequentially penetrate through the third layer of artificially improved lime soil 3, the middle graded gravel layer 2 and the first layer of artificially improved lime soil 1;

a sandstone layer 5 laid on the third layer of artificially improved lime soil 3, wherein the sandstone layer 5 has a fourth thickness;

and the concrete cushion layer 6 is laid on the gravel layer 5, and the concrete cushion layer 6 has a fifth thickness.

In a preferred embodiment of said ultra-thick sludge foundation structure, said second thickness is at least 300 mm.

In a preferred embodiment of the ultra-thick sludge foundation structure, the first thickness is one third of the thickness of the sludge layer.

In the preferred embodiment of the ultra-thick sludge foundation structure, the top of the cast-in-place pile 4 is flush with the top of the third layer of artificially improved lime soil 3 by a predetermined height.

In a preferred embodiment of the ultra-thick sludge foundation structure, the predetermined height is 500 mm.

In a preferred embodiment of the ultra-thick sludge foundation structure, the third thickness is greater than the first thickness.

In a preferred embodiment of the ultra-thick sludge foundation structure, the fourth thickness is at least 300mm and the fifth thickness is at least 100 mm.

In one embodiment, said cast-in-place piles 4 are equally spaced apart.

In one embodiment, the ultra-thick silt foundation structure is used for predicting and judging whether silt soil exists in the construction range before construction, manually improved lime soil, graded broken stones and manually improved lime soil combined filling materials are used for filling silt, mutual supplement is achieved, construction quality is improved, the engineering quantity of piling is reduced, the construction progress is accelerated, and the construction cost is reduced.

In one embodiment, the mass ratio of soil to lime in the artificially improved lime soil is 7: 3, the soil comprises silt. The mass ratio of the broken stone and the sand in the graded broken stone layer is 7: 3. the graded broken stone layer comprises broken stone and sand, the uneven coefficient Cu of the graded broken stone particle is not less than 15, the mass percentage of the particles below 0.02mm is not more than 3%, and the mass percentage of the particles with broken surfaces in the coarse particles larger than 22.4mm is not less than 30%.

In one embodiment, through geological measurement and drilling verification, the artificial improved lime soil + graded broken stone + artificial improved lime soil combined filling material is adopted for filling, then a long screw rod drilling machine is used for forming holes, commercial concrete is poured, graded broken stone is laid, and the like, so that a composite foundation is formed.

In one embodiment, the flow of the ultra-thick sludge foundation structure is as follows:

the method comprises the following steps: analyzing geological data in a construction range, wherein the geological data comprises collecting geological information and past geological disaster information and analyzing possible hazards;

step two: geological exploration, which comprises the steps of determining a plurality of measurement point positions according to the analysis result obtained in the step one and the construction range area, drawing circles by taking the measurement point positions as the centers of the circles, wherein the radius of the circles is less than or equal to 3m, the adjacent circles are circumscribed, the midpoints of the circle center connecting lines of the adjacent circles are also taken as the measurement point positions, and the range of the mucky soil mass possibly existing is determined;

step three: advanced verification, which comprises the steps of performing drilling verification on a possibly existing mucky soil range before foundation pit excavation, and determining a filling range and a filling depth;

step four: excavating earth and replacing filling; according to the replacement and filling range and the replacement and filling depth determined in the step three, trial preparation is carried out according to the characteristics of the soil texture of the site, artificially improved lime soil with the characteristics similar to those of the lower layer soil is configured, the first layer of artificially improved lime soil 1 is replaced and filled, graded broken stones with the thickness of 300mm in the middle layer are replaced and filled, and the third layer of artificially improved lime soil 3 is replaced and filled;

step five: paying off and positioning according to a construction drawing, positioning a long spiral rod drilling machine, and pouring commercial concrete into a drilled hole;

step six: testing and detecting the bearing capacity of the composite foundation;

step seven: after the foundation pit is qualified, excavating a foundation pit foundation trench;

step eight: and paving graded broken stones to construct a foundation.

In one embodiment, the geological condition of the construction range is detected by an ultrasonic technology, and the range and the depth of the mucky soil in the construction range are predicted and judged in advance through drilling verification. The method comprises the steps of adopting manually improved lime soil, graded broken stone and manually improved lime soil to carry out replacement and filling in three layers, firstly adopting the manually improved lime soil to replace and fill the replacement and filling depth to 1/3 according to the actual replacement and filling depth on site after sludge excavation, then paving a middle layer of graded broken stone with the thickness of 300mm, and finally replacing and filling the manually improved lime soil to the position with the pile top elevation of 500mm in the composite foundation design.

In one embodiment, the proportion of the artificially improved soil and ash is determined according to the actual geological condition on site and the bearing capacity of the test section which is checked through a flat plate load test. The elevation of the finished surface of the manually improved lime soil replacement and filling needs to be 500mm higher than the elevation of the pile top in the composite foundation design so as to ensure the requirement of 500mm over-filling height of the pile and the pile forming quality of the long spiral cast-in-place pile 4. Before the long spiral cast-in-place pile 4 is formally constructed, relevant units jointly select unfavorable points according to geological survey data and partitions to test the pile, and whether the vertical bearing capacity characteristic value of the single pile and the bearing capacity characteristic value of the composite foundation meet the design requirements is finally determined through detection.

In one embodiment, the excavation of soil between piles can be performed by manual excavation, mechanical excavation and manual cooperation excavation according to actual conditions, wherein the mechanical excavation is performed along the central line of two rows of piles, and 200mm of earthwork is reserved on each side to be performed by manual excavation so as not to mechanically disturb original soil of a substrate; manually cooperating to excavate, manually cleaning the earthwork close to the pile, and manually excavating the earthwork which cannot be excavated by the machine with the thickness of 150mm reserved at the bottom of the groove. Cutting and polishing the pile head, recording the elevation of the pile head by a level gauge, confirming the height position of manual pile splicing, cutting and cutting a seam by a manual cutting machine, then wedging the pile body by 3 steel brazes at intervals of 120 degrees along the radial direction until the upper pile body is disconnected, manually scraping the pile head by the pile head to achieve surface flatness, strictly controlling the elevation of the designed pile head, and avoiding reducing the effective pile length in design. The laying thickness is 300mm, the tamping degree is not more than 0.9, the graded broken stones are laid by adopting a static compaction method or manual tamping, and vibration tamping cannot be adopted.

In one embodiment, the geological measurement adopts ultrasonic detection equipment to carry out primary detection on the construction range, and the detection depth is 1.3-1.8 times of the excavation depth of the foundation pit; the ultrasonic detection can obtain adverse geological signs, and the detected point location is used as an abnormal point location. The geological measurement also comprises measurement verification, wherein after the abnormal point location is found, repeated measurement is carried out for multiple times to verify whether the equipment is abnormal or not and whether the operation error is caused or not; and after the abnormal point location is determined, drawing a bad range by taking the abnormal point location as the center of a circle and taking 5-10m as a radius, and laying a plurality of transition measurement point locations on the boundary of the bad range for ultrasonic detection again. The non-traditional single replacement filling material is adopted, the area replacement rate of the artificially improved lime soil cushion layer is less than the replacement rate of the plain soil cushion layer, the piling work amount can be obviously reduced, the bearing capacity of the graded broken stone is greater than that of the lime soil cushion layer, but the water permeability is strong, and the erosion of underground water to a foundation cannot be reduced, so that the artificially improved lime soil layer replacement filling and the graded broken stone layer are crossed with each other, the artificially improved lime soil proportion is determined according to a field experiment section, the characteristics of the artificially improved lime soil can be more similar to those of the lower soil, the compactness and the bearing capacity can more easily meet the design requirements, and the stability is good; a300 mm thick graded broken stone layer is superposed in the middle, so that the uneven settlement of a building can be effectively resisted, and the bearing capacity of the foundation is enhanced. After the silt foundation is changed and filled, the influence on the subsequent long spiral rod drilling machine construction, foundation excavation construction and the like is small, meanwhile, the original earthwork 7 (plain soil, expansive soil and rock soil) in the field is utilized to carry out manual improvement, and the method has great advantages in the aspects of economy, operability and the like while ensuring the quality standard of the change and filling.

In one embodiment, the long screw rod drilling machine is adopted for hole forming, the verticality, the hole rotating depth and the like of a drilled hole can be effectively controlled, and the hole forming quality is good. After the long spiral rod drilling machine forms holes, commercial concrete is adopted for continuous pouring, the conveying and quality of the concrete are guaranteed, the compactness is high after pouring, and the quality of a pile body is guaranteed. The composite foundation is connected with the foundation through graded broken stones, and whether the pile end falls on a general soil layer or a hard soil layer, the soil between the piles can be guaranteed to participate in the work all the time. Because the strength and modulus of the pile body are larger than those of the soil between the piles, the stress of the pile top is larger than the surface stress of the soil between the piles under the action of load. The piles can transmit the borne load to a deeper soil layer and correspondingly reduce the load borne by soil among the piles. Thus, the bearing capacity of the composite foundation is improved and the deformation is reduced due to the action of the piles. The long screw rod drilling machine is used for forming holes, the pile body is formed by pouring commercial concrete, the commercial concrete mixing ratio can be optimized according to the place geology and the environment, and the manufacturing cost of the commercial concrete can be reduced while the quality of the pile body is guaranteed.

Finally, it should be noted that: the embodiments described are only a part of the embodiments of the present application, and not all embodiments, and all other embodiments obtained by those skilled in the art without making creative efforts based on the embodiments in the present application belong to the protection scope of the present application.

Certain exemplary embodiments of the present invention have been described above by way of illustration only, and it will be apparent to those of ordinary skill in the art that the described embodiments may be modified in various different ways without departing from the spirit and scope of the present invention. Accordingly, the drawings and description are illustrative in nature and should not be construed as limiting the scope of the invention.

Claims (7)

1. An ultra-thick sludge foundation structure, which is characterized by comprising,

the original earthwork layer is positioned at the position of the ultra-thick silt foundation for removing the silt layer,

a first layer of artificially improved dirt stacked on the original earthwork layer, the first layer of artificially improved dirt having a first thickness, the first layer of artificially improved dirt including sludge in the removed sludge layer;

an intermediate graded crushed stone layer laminated on the first layer of artificially improved lime soil, the intermediate graded crushed stone layer having a second thickness,

a third layer of artificially modified lime-soil laminated on the middle graded crushed stone layer, the third layer of artificially modified lime-soil having a third thickness, the third layer of artificially modified lime-soil including sludge in the removed sludge layer;

the filling piles are vertically distributed at the position of the super-thick sludge foundation in an array mode, are supported on the original earthwork layer and sequentially penetrate through the third layer of manually improved lime soil, the middle grading gravel layer and the first layer of manually improved lime soil;

the sandstone layer is laid on the third layer of artificially improved lime soil and has a fourth thickness;

and the concrete cushion layer is laid on the gravel layer and has a fifth thickness.

2. An ultra thick sludge foundation structure as claimed in claim 1, wherein said second thickness is at least 300 mm.

3. An ultra thick sludge foundation structure as claimed in claim 1, wherein said first thickness is one third of the thickness of the sludge layer.

4. The ultra-thick sludge foundation structure as claimed in claim 1, wherein the top of the cast-in-place pile is flush with the top of the third layer of artificially improved soil top at a predetermined height.

5. The ultra-thick sludge foundation structure as claimed in claim 4, wherein said predetermined height is 500 mm.

6. The ultra-thick sludge foundation structure as claimed in claim 1, wherein said third thickness is greater than said first thickness.

7. The ultra-thick sludge foundation structure of claim 1, wherein the fourth thickness is at least 300mm and the fifth thickness is at least 100 mm.

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